set's the ModifiedSince date. If this is set to something different than DateTime.MinValue, and the FeedQuery object is used for a Service.Query call, this will cause an ifmodified Since header to be created.

public DateTime ModifiedSince { get; set; }

Public Property ModifiedSince As DateTime

public:

property DateTime ModifiedSince {

	DateTime get ();

	void set (DateTime value);

}